<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="root">
        <!--动态组件-->
        <component :is="type"></component>
        <!--<child-one v-if="type === 'child-one'"></child-one>-->
        <!--<child-two v-if="type === 'child-two'"></child-two>-->
        <button @click="handleClick"></button>
    </div>
    <script>
        Vue.component('child-one', {
            template: '<div v-once>child-one</div>'
        })

        Vue.component('child-two', {
            template: '<div v-once>child-two</div>'
        })

        let vm = new Vue({
            el:"#root",
            data: {
                type: 'child-one'
            },
            methods: {
                handleClick: function () {
                    this.type = this.type === 'child-one' ? "child-two" : "child-one"
                }
            }
        })
    </script>
</body>
</html>